狭长型基坑工程坑底抗隆起稳定性分析

发布时间：2018-08-01 09:11

【摘要】：针对狭长型基坑的特点,提出基坑坑底抗隆起稳定分析方法.对比常用的4种坑底抗隆起稳定分析方法及其异同点,结合2个实际工程进行相关算例的分析,指出在软弱土地基中规范要求的抗隆起稳定安全系数偏高;针对现有方法在狭长型基坑稳定分析中的局限性,提出考虑基坑宽度影响的坑底抗隆起稳定计算方法,分别探讨淤泥质土和粉土地基中基坑宽度、支护结构插入深度、开挖深度、土体抗剪强度指标和被动区加固等因素对狭长型基坑稳定性的影响.分析结果表明:采用该方法可以避免狭长型基坑中圆弧滑动面穿过对侧支护结构的问题,合理地考虑基坑宽度等因素对基坑稳定性的影响.
[Abstract]:According to the characteristics of long and narrow foundation pit, a method for stability analysis of pit bottom is proposed. Comparing four common methods of stability analysis and their similarities and differences, combined with the analysis of two practical engineering examples, it is pointed out that the safety factor of anti-uplift stability required by the code in soft soil foundation is on the high side. In view of the limitations of the existing methods in the stability analysis of long and narrow foundation pit, a method for calculating the stability of pit bottom against uplift considering the influence of the width of foundation pit is put forward. The width of foundation pit in silt soil and silty soil foundation, and the depth of insertion of supporting structure are discussed respectively. The influence of excavation depth, soil shear strength index and passive zone reinforcement on the stability of long and narrow foundation pit. The analysis results show that this method can avoid the problem of arc sliding surface passing through the lateral support structure in the narrow and narrow foundation pit and reasonably consider the influence of the foundation pit width and other factors on the stability of the foundation pit.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;中国电建集团华东勘测设计研究院有限公司;
【分类号】：TU753

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